handle fullscreen mode better

chrome/hide_tabs_toolbar.css

@@ -15,6 +15,7 @@ Window controls will be all wrong without it
 :root:not([uidensity="compact"]){--uc-toolbar-height: 38px}
 
 #TabsToolbar{ visibility: collapse !important }
+:root[sizemode="fullscreen"] #TabsToolbar > #window-controls{ visibility: visible !important; z-index: 2 }
 
 :root:not([inFullscreen]) #nav-bar{
   margin-top: calc(0px - var(--uc-toolbar-height));

chrome/hide_tabs_toolbar_osx.css

@@ -13,7 +13,7 @@ Window controls will be all wrong without it
 :root:not([uidensity="compact"]){ --uc-toolbar-height: 34px }
 
 #TabsToolbar > *{ visibility: collapse !important }
-
+:root[sizemode="fullscreen"] #TabsToolbar > #window-controls{ visibility: visible !important; z-index: 2 }
 #TabsToolbar > .titlebar-buttonbox-container{
   visibility: visible !important;
   height:var(--uc-toolbar-height) !important;

chrome/hide_tabs_with_one_tab.css

@@ -4,6 +4,7 @@ See the above repository for updates as well as full license text. */
 /* Makes tabs toolbar items zero-height initially and sets enlarge them to fill up space equal to tab-min-height set on tabs. Optionally use privatemode_indicator_as_menu_button.css to replace main menu icon with private browsing indicator while tabs are hidden. */
 /* Firefox 65+ only */
 
+
 :root[sizemode="normal"] #nav-bar{ --uc-window-drag-space-width: 20px }
 
 #titlebar{ -moz-appearance: none !important; }
@@ -53,6 +54,6 @@ See the above repository for updates as well as full license text. */
 :root[tabsintitlebar] #toolbar-menubar[autohide="true"][inactive]{
   transition: height 0ms steps(1) 80ms;
 }
-#nav-bar{
+:where(#nav-bar){
   border-inline: var(--uc-window-drag-space-width) solid var(--toolbar-bgcolor);
 }

chrome/hide_tabs_with_one_tab_w_window_controls.css

@@ -62,3 +62,9 @@ Window controls will be all wrong without it
 }
 
 :root:not([customizing]) #toolbar-menubar[autohide][inactive] > #menubar-items{ pointer-events: none; opacity: 0 }
+
+:root[sizemode="fullscreen"] .titlebar-buttonbox-container{ display: none !important; }
+:root[sizemode="fullscreen"] #TabsToolbar > #window-controls{
+  z-index: 2;
+  top: calc(var(--tab-min-height) + 2 * var(--proton-tab-block-margin,0px));
+}

chrome/tabs_on_bottom_menubar_on_top_patch.css

@@ -4,10 +4,10 @@ See the above repository for updates as well as full license text. */
 /* Menubar on top patch - use with tabs_on_bottom.css */
 /* Only really useful if menubar is ALWAYS visible */
 
-:root{ --uc-window-control-width: 0px !important }
+:root:not([sizemode="fullscreen"]){ --uc-window-control-width: 0px !important }
 
 #navigator-toolbox{ padding-top: calc(29px + var(--uc-titlebar-padding,0px)) !important }
-
+:root[sizemode="fullscreen"] #navigator-toolbox{ padding-top: 0px !important; }
 #toolbar-menubar{
   position: fixed;
   display: flex;

chrome/window_control_placeholder_support.css

@@ -14,7 +14,15 @@ See the above repository for updates as well as full license text. */
   --uc-window-control-width: 138px; /* Space reserved for window controls */
   --uc-window-drag-space-width: 24px; /* Extra space reserved on both sides of the nav-bar to be able to drag the window */
 }
-
+:root[sizemode="fullscreen"] .titlebar-buttonbox-container{ display: none !important }
+:root[sizemode="fullscreen"] #window-controls{
+  position: fixed;
+  display: flex;
+  top: 0;
+  right:0;
+  height: 40px;
+}
+:root[uidensity="compact"][sizemode="fullscreen"] #window-controls{ height: 32px }
 #nav-bar{
   border-inline: var(--uc-window-drag-space-width,0px) solid var(--toolbar-bgcolor);
   border-inline-style: solid !important;